TT#82650 fix /list never ending output

Change-Id: I23966c6d05f24ab3f2f43f58c7c0cf0fda1ca214
(cherry picked from commit 7063a27f70)

kernel-module/xt_RTPENGINE.c

@@ -1446,6 +1446,9 @@ static void *proc_list_next(struct seq_file *f, void *v, loff_t *o) {	/* v is in
 	*o = (addr_bucket << 17) | port;
 	table_put(t);
 
+	if (!g) // EOF
+		*o = 256 << 17;
+
 	return g;
 }